Backout or nipple wrench



June 12, 1951 E, M, RQDDICK 2,556,945

BACKOUT 0R NIPPLE WRENCH Filed Feb. 24. 1947 K l NVENTOR.

Eric M, Roddick.

' HTTORNEX Patented .une i2, 195:1

UNITED STATES PATENT FFICE BACKOUT OR NIPPLE WRENCH Eric M. Roddick,Long Beach, Calif.

Application February 24, 1947, Serial No. 730,243

(fCl. 81--72) 1 Claim. 1

This invention relates to a backout or nipple wrench whereby a pipe,nipple or the like can be internally engaged and gripped, and eitherthreaded or unthreaded, as desired.

An object of my invention is to provide a simple compact and inexpensivewrench of the character stated, which will eiectively grip the inside ofa pipe or nipple, and will rotate this object either right hand or lefthand, as desired.

A feature of my invention resides in the mounting of the rotatable ring,this mounting being so arranged that the ring will grip the inside of apipe or nipple either right hand or left hand rotation, and with arelatively short arcuate movement of the bodyof the tool when changingfrom one direction of rotation to another.

Other objects, advantages and features of in vention may appear from theaccompanying drawing, the subjoined detailed description and theappended claim.

In the drawing:

Figure 1 is a top plan View of my wrench.

Figure 2 is a side elevation of the same.

Figure 3 is a side elevation of the tool with the rotating and assemblyrings removed.

Figure 4 is a bottom plan View of the assembly shown in Figure 3.

Figure 5 is a transverse sectional view of the rotatable ring.

Figure 6 is a top plan view of the same.

Figure '7 is a side elevation of the same.

Figure 8 is a top plan view of the assembly ring.

Figure 9 is a side elevation of the same.

Referring more particularly to the drawing, my backout or nipple wrenchI consists of a hexagonal head 2, this head being also formed with asquare recess 3, which can be engaged by an internal wrench, if desired.A knurled ring 4 is integrally formed on the wrench below the head 2,and a post 5 extends below the ring 4. The post 5 is eccentric to thecenter line of the wrench, and a rotatable ring 6, when rotated on thepost, will move outwardly to engage the inside of a pipe or nipple, aswill be further described. The rotating ring 6 is journaled on the post5 and is formed with an eccentric bore l, which accurately ts the post5. The rotating ring 8 is held in assembled position by a locking o1'assembly ring 8, which fits on the bottom of the post 5 and isnonrotatably held on the post by suitable means, such as the pin 9. Itis to be noted that the rings 4 and 8 are concentric with the centerline of 2 the tool, and also these two rings ar-e always in alignment.

An annular groove I9 is cut in the top surface of the ring 6, and a pinl l extends upwardly into this groove from the body of the ring. The topoi the pin Il is substantially flush with the top of the ring 8. A stoppin l2 extends downwardly from the ring 4, and the bottom of this pin issubstantially ush with the bottom of the groove I9. It will thus beevident that the pins Il, l2 will strike and stop further rotation ofthe ring 8 when the ring is in alignment with the upper and lower rings4 and -that is, when the rings 4, 6 and 8 are all in alignment, the pinsl l, l2 are engaged, thus holding the entire assembly in proper positionto be inserted in a pipe or nipple.

In operation, the rings 4 and 8 will engage the inside of a pipe ornipple, and rotation of the ring 6 Will then move it outwardly to engagethe pipe or nipple approximately from where the rings 4 and 8 areengaging. A relatively small angular adjustment is all that is necessaryto enable the tool to grip the pipe or nipple for either left hand orright hand rotation.

Having described my invention, I claim:

A backout wrench comprising a head, a xed ring, a post eccentric withrespect`to said xed ring, with the head, ring and post formedintegrally, a rotatable ring journaled on the post adjoining the fixedring and provided with an annular groove, a mounting ring fixed to thepost concentric with the ixed ring and holding the rotatable ring on thepost, the three rings being of equal and constant diameters throughouttheir widths, a pin mounted in the annular groove of the rotatable ringand a second pin carried by one of the other rings projecting into saidgroove.

ERIC M. RODDICK.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 1,152,195 Maxwell Aug. 31, 19152,282,743 Pervier May 12, 1942 FOREIGN PATENTS Number Country Date 3,231Great Britain Nov. 29, 1871 ,120,783 Great Britain Nov. 27, 1918

